globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13539
论文题名:
An invasive wetland grass primes deep soil carbon pools
作者: Bernal B.; Megonigal J.P.; Mozdzer T.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:5
起始页码: 2104
结束页码: 2116
语种: 英语
英文关键词: deep root growth ; Phragmites australis ; priming ; Schoenoplectus americanus ; Spartina patens
Scopus关键词: Phragmites australis ; Schoenoplectus americanus ; Spartina patens
英文摘要: Understanding the processes that control deep soil carbon (C) dynamics and accumulation is of key importance, given the relevance of soil organic matter (SOM) as a vast C pool and climate change buffer. Methodological constraints of measuring SOM decomposition in the field prevent the addressing of real-time rhizosphere effects that regulate nutrient cycling and SOM decomposition. An invasive lineage of Phragmites australis roots deeper than native vegetation (Schoenoplectus americanus and Spartina patens) in coastal marshes of North America and has potential to dramatically alter C cycling and accumulation in these ecosystems. To evaluate the effect of deep rooting on SOM decomposition we designed a mesocosm experiment that differentiates between plant-derived, surface SOM-derived (0–40 cm, active root zone of native marsh vegetation), and deep SOM-derived mineralization (40–80 cm, below active root zone of native vegetation). We found invasive P. australis allocated the highest proportion of roots in deeper soils, differing significantly from the native vegetation in root : shoot ratio and belowground biomass allocation. About half of the CO2 produced came from plant tissue mineralization in invasive and native communities; the rest of the CO2 was produced from SOM mineralization (priming). Under P. australis, 35% of the CO2 was produced from deep SOM priming and 9% from surface SOM. In the native community, 9% was produced from deep SOM priming and 44% from surface SOM. SOM priming in the native community was proportional to belowground biomass, while P. australis showed much higher priming with less belowground biomass. If P. australis deep rooting favors the decomposition of deep-buried SOM accumulated under native vegetation, P. australis invasion into a wetland could fundamentally change SOM dynamics and lead to the loss of the C pool that was previously sequestered at depth under the native vegetation, thereby altering the function of a wetland as a long-term C sink. © 2016 John Wiley & Sons Ltd
资助项目: This study was funded by Maryland Sea Grant (SA7528082, SA7528114-WW), the National Science Foundation Long-Term Research in Environmental Biology Program (DEB-0950080, DEB-1457100, and DEB-1557009), Major Research Instrumentation Program (EAR-1428975), Bryn Mawr College, and the Smithsonian Institution. We thank R. Saad, B. Kelly, J. Duls, I. Fernández, D. Arango, A. Langley, J. Villa, P. Mueller, I. Casas, and A. Peresta for assistance in the field and laboratory. We also thank three anonymous reviewers for constructive comments that substantially improved the manuscript.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60981
Appears in Collections:影响、适应和脆弱性

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作者单位: Smithsonian Environmental Research Center, 647 Contees Wharf Rd, Edgewater, MD, United States; Department of Biology, Bryn Mawr College, 101 N Merion Ave, Bryn Mawr, PA, United States

Recommended Citation:
Bernal B.,Megonigal J.P.,Mozdzer T.J.. An invasive wetland grass primes deep soil carbon pools[J]. Global Change Biology,2017-01-01,23(5)
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